Keith (Stanford University, California, USA) Devlin 
Mathematics Education for a New Era [PDF ebook] 
Video Games as a Medium for Learning

Stanford mathematician and NPR Math Guy Keith Devlin explains why, fun aside, video games are the ideal medium to teach middle-school math. Aimed primarily at teachers and education researchers, but also of interest to game developers who want to produce videogames for mathematics education, Mathematics Education for a New Era: Video Games as a Med